NDLI: Influence of calcination on performance of Bi–Ni–O/gamma-alumina catalyst for <i>n</i>-butane oxidative dehydrogenation to butadiene

Content Provider	Royal Society of Chemistry (RSC)
Author	Jermy, B. Rabindran Asaoka, S. Al-Khattaf, S.
Copyright Year	2015
Abstract	Influence of calcination on the binary-metal oxide 30 wt% Bi-20 wt% Ni–O/gamma-Al2O3 catalyst was studied for n-butane oxidative dehydrogenation to 1,3-butadiene. The importance of the calcination was confirmed with the facts that (1) the two step calcination of more than 2 h at the 2nd step resulted in higher activity and selectivity to butadiene and (2) the second step calcination temperatures showed clear effects on the activity and the selectivity. The activity showed a volcano shaped trend, with the top at 590 °C and at a lower reaction temperature, 400 °C, and a downward slope at 450 °C. As for the reaction selectivity, either the total dehydrogenation or the specific butadiene selectivity showed a volcano shape with the calcination temperature. The top along the calcination temperature existed at 590 °C in both cases of 400 °C and 450 °C reaction temperatures. Conversely, the selectivity of oxygenate formation (partially followed by cracking) or partial oxidation to CO/H2 showed a valley shape with the bottom at 590 °C or 650 °C along the calcination temperature, respectively. The butadiene selectivity was more strongly influenced competitively by both the oxygenate formation and the partial oxidation. From the catalyst characterization, it was observed that the redox and acid/base system (active and selective to the reaction) of the combined oxides with porous structure are formed as a cohabitation consisting of ‘hierarchical nanoparticles’ (NiO, alpha-/beta-Bi2O3 and gamma-Al2O3), resulting from catalyst calcination in preferable conditions.
Starting Page	4622
Ending Page	4635
Page Count	14
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	5
Issue Number	9
Journal	Catalysis Science & Technology
DOI	10.1039/c5cy00819k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Volcano Butane Downward Slope Acid Dehydrogenation Redox Calcination 1,3-Butadiene
Content Type	Text
Resource Type	Article
Subject	Catalysis

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